Palladium leaching dependent on reaction parameters in Suzuki–Miyaura coupling reactions catalyzed by palladium supported on alumina under mild reaction conditions

Effects of Cl on the reduction of supported PdO in ethanol/water solvent mixtures

“…Chlorinated Pd catalysts were prepared by wet impregnation, using PdCl 2 as a metal precursor, and γ-Al 2 O 3 (Alfa Aesar; pellets pre-ground/sieved to between a 90 and 75 μm mesh fraction) as described previously [23,24], followed by drying in air at 373 K. The samples were then calcined in flowing air (1 K min −1 ramp to 773 K and held at temperature for 4 h before cooling at 1 K min −1 ). Once cooled the samples were then sieved again to a 75-90 μm mesh fraction before use.…”

Effect of retained chlorine in ENCAT™ 30 catalysts on the development of encapsulated Pd: insights from in situ Pd K, L3 and Cl K-edge XAS

“…The 1 and 5 wt% Pd/Al 2 O 3 catalysts used for comparative purposes in this paper were prepared using PdCl 2 wet impregnation to γ-Al 2 O 3 as described previously [23,24] followed by drying (air at 373 K), calcination at 773 K, and then reduction under flowing H 2 at 773 K. The as made 5wt% Pd/Al 2 O 3 catalyst yielded a size distribution of particle between 2 and 4 nm in diameter in TEM (Jeol 2100F microscope) and a PdPd CN of 8 (from Pd K-edge EXAFS) after reduction in ethanol/ water to 350 K. The 1 wt% Pd/ Al 2 O 3 reference catalyst did not yield readily observable particles in TEM and gave a PdPd CN of ca. 7 after equivalent reduction.…”

Oxide-Supported Palladium and Gold Nanoparticles for Catalytic C-H Transformations

“…9 Initially, supported Pd(OH) 2 on metal oxides were prepared by the deposition precipitation (DP) method using PdCl 2 as a precursor in basic aqueous solution (pH 8) at 70 for 1 h and then drying in air at 70 overnight. 10,11 Pd(OH) 2 / ZrO 2 was calcined in air at 300 for 4 h to give PdO/ZrO 2 and then treated in a stream of pure H 2 (40 mL/min) at 200 for 2 h to form Pd/ZrO 2 . According to HAADF STEM, Pd NPs of 10 wt% Pd(OH) 2 /ZrO 2 were well dispersed, and the mean diameter was calculated to be 1.8 0.9 nm.…”

“…First, the reaction conditions were optimized for the ace- toxylation of allylbenzene (10) in the presence of commercially available 5 wt% Pd/C (Table 6). Cinnamyl acetate (11) was obtained as a major product.…”